Sash lock for windows



NOV. 22, 1960 A w, ,Al-" GrvEN 2,961,263

SSH LOCK FOR WINDOWS Filed Dec. 18, 1957 UIT-fomyf l A. w. AHLGREN SASH LOCK FOR WINDOWS 2 Sheets-Sheet 2 che) @JCR Egrem a2, 1MM/@QQ cjb-*romanz- Nov. 22, 1960 Filed nec. 18, 1957 l l l l .1 1111111111 /1/11 //1 111/1/ 1/ 1111/111111/111/ 1/ 1111/11111111//1//11/ 11111111111111111111 1/11 111 11 1 1 1 1 11 11 1/1 /1/ l/1/ 1/111//11/1/111//111/1 //r////1//1//111/1// 111111111/11111111 lice SASH LOCK FOR WINDOWS Axel W. Ahlgren, Rockford, Ill., assignor to Amerock Corporation, Rockford, Ill., a corporation of Illinois Filed Dec. 18, 1957, Ser. No. 703,662

2 Claims. (Cl. 292-140) This invention relates to a sash lock for locking a window having two sashes one or both of which slide in the window frame and has more particular reference to a sash lock which may be used with sashes that do not have the usual wooden side rails but, instead, consist simply of a pane of glass.

The general objectof the invention is to provide a new and improved sash lock which permits all of its parts to be mounted on the window frame so that it may be used to lock windows whose sashes do not have wooden side rails and which, at the same time, effectively locks the window.

A more detailed object is to provide the lock with a bolt which slides forward into frictional gripping engagement with one sash to lock the latter and which causes the engaged sash to clamp the other sash against sliding.

Other objects and advantages of the invention will become apparent from the following detailed description taken in connection with the accompanying drawings, in which Figure 1 is a perspective view of a window employing the novel sash lock of the present invention.

Fig. 2 is an enlarged perspective view of the sash lock.

Fig. 3 is an enlarged fragmentary sectional view taken along the line 3 3 in Fig. l.

Fig. 4 is a view similar to Fig. 3 but shows the parts in a different position.

Fig. 5 is a fragmentary sectional view taken along the line 5-5 in Fig. 2.

Fig. 6 is a view similar to Fig. 5 but shows the parts in a different position.

Fig. 7 is an exploded perspective view of the sash lock.

Fig. 8 is an enlarged sectional View taken along the line 8-8 in Fig. 7.

Fig. 9 is a sectional view taken along the line 9 9 in Fig. 5.

As shown in the drawings for purposes of illustration, the invention is embodied in a lock 10 for the sashes 11 and 12 of a window and is particularly useful in connection with windows in which there are no sash rails surrounding the glass. Thus, the sashes herein are simply rectangular panes of glass sliding horizontally in channels 13 (Fig. 3) which are secured to the window frame 14. The sashes slide on a hard rubber strip 15 which is disposed in the bottom of the channel 13 and is formed with a central rib 16 to define individual tracks or guideways 17 and 18 for the two sashes. When closed, the adjacent edge portions of the sashes overlap each other as shown in Figs. 5 and 6.

The present invention contemplates the provision of a novel sash lock 10 which, instead of being secured to one of the sashes 11 and 12, may be mounted on the frame 14 and which still effectively prevents the sashes from sliding in the channel 13. To these ends, the lock includes an elongated bolt 19 which is perpendicular to the sashes and which slides longitudinally on a base or sup- :central boss 24 on which the bolt 19 slides.

port 20 so that it may be projected into engagement with ,i the overlapping portion of the inner sash. The forward end of the bolt is provided with a yieldable friction surface 21 whichengages the sash 11 when the bolt is advanced.

With the foregoing arrangement, the window is locked by closing the sashes 11 and 12 and projecting the bolt 19 into engagement with the sash 11. The bolt engagesv the latter with sufcient pressure that this sash bows outwardly and clamps the outer sash 12 against one side wall of the channel 13. Such clamping prevents the sash 12 from sliding in its track 18. At the same time, the frictional gripping of the inner sash 11 by the surface 21 prevents this sash from sliding in its track 17 and thus both sashes are effectively locked and cannot be opened from the outside.

In the present instance, the base 20 is a sheet metal stamping adapted to be fastened by screws 22 to the center of the sill 23 of the window frame 14 and having a The bolt is an elongated flat plate formed with laterally and longitudinally spaced lugs 25 which are punched down from the plate to project into slots 26 in the boss 24 and guide the sliding of the bolt. Such sliding is effected by a handle 27 which comprises a circular plate 28 and an integral, laterally projecting finger piece 29. The handle is journaled on the base 20 by means of a pin 30 (Fig. 7) projecting down from the center of the plate 28, through a longitudinal slot 31 in the bolt 19 and through a hole 32 in the boss 24. A compression spring 33 (Fig. 4) encircling the lower end portion of the pin acts between the boss and a cap 34 secured to the end of the pin to hold the handle against the bolt and the bolt against the boss.

In order to translate turning of the handle 27 into sliding of the bolt 19, a lug 35 (Fig. 7) which is radially spaced from the pin 30 projects down from the circular plate 28 and into a slot 36 in the bolt. The slot 36 extends rearwardly and to one side of the slot 31 so that, as the finger piece 29 is turned from a position parallel to the bolt (Fig. 4) to a position perpendicular to the bolt (Fig. 2), the lug 35 cams the bolt forward and against the sash 11. When the handle is turned in the opposite direction, the lug retracts the bolt.

Herein, the friction surface 21 is the outer side of a band 37 which is made of a yieldable material having a coetlicient of friction substantially greater than the coefcient of friction of glass, such as rubber, and which encircles a flange 38 projecting downwardly from the forward end of the bolt 19. A at spring strip 39 is disposed between the front of the flange 38 and the band 37 and is bowed outwardly to urge the surface 21 resiliently outwardly. As shown in Fig. 6, the friction surface 21 is composed of ribs 40 (Figs. 5 and 6), those on one side of center being inclined in one direction and those o-n the other side being inclined in the opposite direction. In this way, each set of ribs prevents the sash 11 from sliding in one direction.

With the foregoing arrangement, the window is unlocked and the sashes 11 and 12 free to slide when the finger piece 29 extends along the bolt 19 and the latter is retracted as shown in Figs. 4 and 6. When the sashes are closed, the window may be locked by turning the linger piece so that it is at right angles to the bolt. This projects the bolt forwardly into resilient engagement with the sash 11 as shown in Figs. 3 and 5. As a result, the inner sash 11 bows outwardly and clamps the outer sash 12 against the channel 13 so that the latter sash is locked in the closed position. At the same time, the friction surface 21 of the band 37 grips the inner sash so that this sash cannot slide in its track. Thus, the window Patented Nov. 22, 1`96o'f is locked closed and this has been achieved without mounting any parts of the lock on either sash.

I claim as my invention:

1. A lock for use with a window having a glass sash which slides in a frame, said lock comprising a base adapted to be mounted on said f rame adjacent said sash, a bolt mounted on said base to slide forward toward said sash and back and having a at forward endparalleling said sash, an elongated member made of yieldable material carried on and extending across the forward end of said bolt and having a forwardly facing friction surface adapted to engage said sash, an elongated spring strip extendingfacross the forward end of said bolt and disposed between the bolt and said member, said strip normally being bowed outwardly to bow said member resiliently outwardly and give said surface a convex contour, and mechanism mounted on said base and operatively connected to said bolt to slide the bolt forward thereby to atten said surface and said strip and cause the strip to press said surface against said sash. Y

2. A lock for use with a window having a glass sash which slides back and forth in the frame, said lock cornprising a base adapted to be mounted on said frame adjacent said sash, a bolt mounted on said base to slide forward toward said sash and back, a member made of yieldable material carried on the forward end of said lbolt and having a forwardly facing friction surface adapted to engage said sash, means operable to bow said member resiliently outwardly to give said friction surface a convex contour, ribs formed integrally with said member and extending across said surface transversely of the direction of sliding of the sash, said ribs being formed in two sets with the ribs of one set being inclined laterally in one direction and the ribs of the other set being inclined laterally in the opposite direction, and mechanism mounted on said base and operatively connected to said bolt to slide the bolt forward thereby simultaneously to press both of said sets of ribs against said sash and prevent sliding of the sash lin either direction.

References Cited in the file of this patent UNITED STATES PATENTS 592,070 Turner Oct. 19, 1897 959,145 Kellem May 24, 1910 1,509,923 Berryman Sept. 30, 1924 1,623,343 Hill Apr. 5, 1927 1,957,113 Smith May 1, 1934 2,120,692 Butts n June 14, 1938 2,574,961 Couture Nov. 13, 1951 2,656,574 Kaufmann v Oct. 27, 1953 2,703,728 Raber 2 Mar. 8, 1955 

